validation and connection change

Author: yuktatechgog

metadata.yaml

@@ -24,7 +24,7 @@ spec:
     source:
       repo: https://github.com/terraform-google-modules/terraform-google-cloud-router.git
       sourceType: git
-    version: 7.4.4
+    version: 7.4.5
     actuationTool:
       flavor: Terraform
       version: ">= 1.3"

modules/interconnect_attachment/metadata.yaml

@@ -25,7 +25,7 @@ spec:
       repo: https://github.com/terraform-google-modules/terraform-google-cloud-router.git
       sourceType: git
       dir: /modules/interconnect_attachment
-    version: 7.4.4
+    version: 7.4.5
     actuationTool:
       flavor: Terraform
       version: ">= 1.3"

modules/interconnect_attachment/versions.tf

@@ -26,6 +26,6 @@ terraform {
   }
 
   provider_meta "google" {
-    module_name = "blueprints/terraform/terraform-google-cloud-router:interconnect_attachment/v7.4.4"
+    module_name = "blueprints/terraform/terraform-google-cloud-router:interconnect_attachment/v7.4.5"
   }
 }

modules/interface/main.tf

@@ -1,5 +1,5 @@
 /**
- * Copyright 2020 Google LLC
+ * Copyright 2025 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,6 +14,29 @@
  * limitations under the License.
  */
 
+locals {
+  has_ip_range                = var.ip_range != null
+  has_vpn_tunnel              = var.vpn_tunnel != null
+  has_interconnect_attachment = var.interconnect_attachment != null
+
+  # True if exactly one of vpn_tunnel or interconnect_attachment is set
+  exactly_one_link_type = ((local.has_vpn_tunnel ? 1 : 0) + (local.has_interconnect_attachment ? 1 : 0)) == 1
+}
+
+# Validation Resource: Enforces the connection type rules
+resource "null_resource" "interface_connection_validation" {
+  lifecycle {
+    precondition {
+      condition = (
+        (local.has_ip_range && !local.has_vpn_tunnel && !local.has_interconnect_attachment) ||
+        (!local.has_ip_range && local.exactly_one_link_type) ||
+        (local.has_ip_range && local.exactly_one_link_type)
+      )
+      error_message = "Invalid argument combination for router interface. Please provide: (1) only ip_range, OR (2) exactly one of (vpn_tunnel, interconnect_attachment), OR (3) ip_range AND exactly one of (vpn_tunnel, interconnect_attachment)."
+    }
+  }
+}
+
 resource "google_compute_router_interface" "interface" {
   name                    = var.name
   project                 = var.project_id

modules/interface/metadata.yaml

@@ -25,7 +25,7 @@ spec:
       repo: https://github.com/terraform-google-modules/terraform-google-cloud-router.git
       sourceType: git
       dir: /modules/interface
-    version: 7.4.4
+    version: 7.4.5
     actuationTool:
       flavor: Terraform
       version: ">= 1.3"
@@ -54,8 +54,8 @@ spec:
         required: true
         connections:
           - source:
-              source: github.com/terraform-google-modules/terraform-google-cloud-router
-              version: ">= 7.4.0"
+              source: github.com/yuktatechgog/terraform-google-cloud-router
+              version: ">= 7.4.5"
             spec:
               outputExpr: router.name
           - source:
@@ -120,3 +120,5 @@ spec:
     providerVersions:
       - source: hashicorp/google
         version: ">= 5.12, < 8"
+      - source: hashicorp/null
+        version: ~> 3.2

modules/interface/versions.tf

@@ -22,9 +22,13 @@ terraform {
       source  = "hashicorp/google"
       version = ">= 5.12, < 8"
     }
+    null = {
+      source  = "hashicorp/null"
+      version = "~> 3.2"
+    }
   }
 
   provider_meta "google" {
-    module_name = "blueprints/terraform/terraform-google-cloud-router:interface/v7.4.4"
+    module_name = "blueprints/terraform/terraform-google-cloud-router:interface/v7.4.5"
   }
 }

versions.tf

@@ -25,7 +25,7 @@ terraform {
   }
 
   provider_meta "google" {
-    module_name = "blueprints/terraform/terraform-google-cloud-router/v7.4.4"
+    module_name = "blueprints/terraform/terraform-google-cloud-router/v7.4.5"
   }
 
 }